Excitation power supply for suppressing overshoot phenomenon of laser pulse

Abstract

The invention discloses an excitation power supply for suppressing an overshoot phenomenon of laser pulse. The excitation power supply comprises a control module, a switching power supply module and a resonance module, wherein the control module outputs a driving pulse signal with variable frequencies; after the driving pulse signal is processed by the switching power supply module, an alternating current square wave signal is output; and after the alternating current square wave signal is subjected to amplitude modulation by the resonance module, the alternating current square wave signal is converted into a periodical excitation signal which has a low electric level and then a high electric level in sequence in each period. The excitation signal output by the excitation power supply can suppress the overshoot phenomenon; meanwhile, the rise of the laser pulse becomes more steep, so that the requirement on the laser pulse output waveform in laser processing can be satisfied; and therefore, the excitation power supply is of great significance to the improvement of the laser pulse processing quality and efficiency.

Description

Technical field [0001] The invention belongs to the field of laser technology, and in particular relates to an excitation power supply for suppressing the overshoot phenomenon of laser pulses. Background technique [0002] In the field of laser applications, axial fast flow CO 2 Lasers are widely used in laser processing fields such as cutting and welding due to their high power and high beam quality. By He, N 2 , CO 2 Under the action of the excitation power source, the mixed gas composed of such components produces glow discharge. The stability of gas discharge has a direct influence on the output of laser. In order to realize the stability of glow discharge, PWM modulation method is generally used to control the laser output power. Therefore, the axial fast flow CO 2 The laser outputs a series of "quasi-continuous" laser pulses, and the waveform of a single laser pulse has an important influence on the quality and efficiency of laser processing. Such as figure 1 As shown, the...

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Problems solved by technology

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention provides an excitation power supply for suppressing laser pulse overshoot phenomenon, aiming to solve the problem that the output signal of the existing excitation power supply cannot realize the amplitude adjustment of the laser pulse The shape cannot meet the technical problems of laser processing

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